Question about qemuDomainLogContextNew

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Hi, Dear all
    I have a question, and need your help. 
    I want to output some log message to "/var/log/libvirt/qemu/instance-xxxxxx" when guest kernel crashed, so I add following the code:
    >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

    static int
    qemuProcessHandleGuestPanic(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
                                        virDomainObjPtr vm,
                                                                    void *opaque) { ......
    +    qemuDomainLogContextPtr logCtxt = NULL;

    +    if (!(logCtxt = qemuDomainLogContextNew(driver, vm, QEMU_DOMAIN_LOG_CONTEXT_MODE_START))){
    +        VIR_WARN("Unable to open domainlog");
    +        goto cleanup;
    +    }

        ......
    }

    <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

    But this code cannot get the logCtxt,   
    logCtxt = qemuDomainLogContextNew(driver, vm, QEMU_DOMAIN_LOG_CONTEXT_MODE_START)  always return NULL, so I CANNOT write message to log file.

    Really Need your help, Thanks!

    Thanks
    Feng

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